Repeater circuits



Oct. 16-, 1923. 1,470,982

J. s. JAMMER REPEATER CIRCUITS Filed Oct. 29 1920 /n Yen/0r: Jacob 5. Jam/ner- Patented Oct. 16, 1923.

UNITED STATES PATENT OFFICE.

JACOB S. JAMMER, OF NEW YORK, N. Y., ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

REPEATER CIRCUITS.

Application filed October 29, 1920.

To all im'io-mit may concern:

Be it known that I, JACOB S. JAMMER, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Repeater Circuits, of which the following is a full, clear, concise, and exact description.

This invention relates to two-way repeating systems particularly of the type in which a plurality of repeaters are employed between each set of connected line sections.

Heretotore in two-way repeating systems employing two repeater elements, it has been common practice to employ one of the repeaters for repeating in one direction be tween the line sections, the other repeater being employed for repeating in the opposite direction.

In accordance with this invention it is possible to employ both of the repeaters for repeating in either direction whereby the power output oi the repeater unit. is doubled, so that a more etlicient use of the repeater unit results therefrom.

The preferred form of this invention employs a repeater unit, in which two repeaters are connected in opposition, an arrangement known in the art as a push-pull circuit. In such an arrangement, certain portions of the input and output circuits of the repeaters are individual, while other portions are in common. In such a push-pull arrangement, currents may be applied to the common portion of the input circuit and led off from the common portion of the output circuit without interfering in any wise with currents applied to the individual portions oi the input circuit and led off from the individual portions of the output circuit. The pushpull arrangement. therefore, may be employed for two-way repeating by having input and output connections for repeating in one direction applied to the common pol tions of the input and output circuits and by having the corresponding connections tor repeating in the other direction applied to the individual portions of the input and output circuits.

This invention will be better understood by reference to the following detailed description taken in connection with the accompanying drawing, in which Fig. 1 illustrates this invention embodied in a 22 type repeater circuit and Fig, 2 illustrates this Serial No. 420,478.

three-winding transformer.

Connected between the two three-winding transformers. is a two-way repeater comprising similar vacuum tube repeater elements 15 and 16, which are arranged in the socalled push-pull circuit, repeaters 15 and 16 being of the three-electrode type now well-known in the art. The individual portions ol the input circuits of repeaters 15 and 16 are associated with the third winding 19 ot the three-limb transformer 20 by means of? the transformers 21 and 22. The common portion of the input circuit of repeaters 15 and 16 is associated with the third-winding 2t ot the three-winding transformer 95 by means of transformer 26. The individual portions of the output circuits of the two ripeaters are connected to the midpoints o't transformer windings 11 and 12 by means of, the two transformers 27 and 28. The common branch of the out put circuits of the repeaters by transformers 29. is connected to the midpoints of transformer windings 9 and 10. Tubes 15 and 16 should preferably have similar characteristics so that their output circuits are the same for given changes in grid potential. Input transtormers 21 and 22 should be so designed that the incoming currents from line section impress equal and opposite potentials on the two control electrodes and 32 oi. the repeaters. The currents in the smondary winding of transformer 26 in such a case, due to currents from line 5, would be zero. Another way of stating this rela tionship is, that currents from line section 6 through transformer winding 2% and transformer 26 should impress equal and opposite currents in those winding on transt'orniers 21 andQZ which are in circuit with winding 19. Vith respect to the output transformers 27, 9S and 29, transformers 27 and 28 should be so designed that amplified currents in the output circuits of repeaters lUl l5 and 16 due to currents impressed by input transformers 21' and 22, produce Zero current in the secondary winding of output transformer 29, or, in other words, amplified currents in the output circuits of the repeaters due to currents impressed by the input transtormer 26 should produce equal. and opposite currents in the secondary windings of transformers 27 and 28.

The method of operation of the arrangement of Fig. 1, may now he described as tollows Incoming currents from line section 5 are impressed through windings l0 and 19 oi. translormer 20 and transformers 21 and upon the two control electrodes of the repeaters in such a manner that the potentials of the two electrodes are changed in equal and opposite amounts. Corresponding am plilied currents are producedin the same di rection in transformers 2'7 and 28 so that amplified cln'rents, are impressed. thereby upon the outgoing line sectiont. Since the currents 'tiowin in the primary windings 0t trarslku-mers 2'1 and 28, are in the same direction, it follows that none of the amplified currents are fed hack to line 5 through the transtormer 529 which is located in the common portions of the output circuit. Since connections .t'romthe secondary windings at trensl'in'rners 2i and are made to the mid points oi? transim'mer windings ll and L2, none ot' the amplified currents can find their way hack through the third-winding 24th? transformer 25, into the input circuit ot the repeater.

incoming; currents from line section 6,

flowing serially through both sections of windings 11. and 12, by means of the third winding 24: are impressed upon the common portion of the input circuit of the repeater whereby the currents to he an'iplified, produce equal. variations of the same polarity in the potential of the two controlelectrodes and 352. Currents so impressed upon the two control electrodes will produce ainplilied currents in opposite directions in the primary windings oi? transformers 27 and 28., but will produce additive amplified currents n the primary winding of transformer 29. It follows therefore that the rinplitsed currents, by means oit' transformer 29. will he .iTflPiGSSGll upon the outgoing line section From the above description, it is appar that repeaters 15 and 16 are employed 'i'or amplifying currents in both directions between th line sections. and 6.

it is olniousv that transformers 21 and 22 may be combined intoone transformer on a single core structure as shown by transiornier ll of Fig. 2; a similar substitution can he made tortransformers 27 and 28.

i i 2 illustrates this invention in conneetour-wire repeater circuit, and

the operation or". the system is essentiallytl e same as that described in connection with lip. 1. Incoming; currents from line sec tion 4-0, by means or transformer 'rl, impress equal and opposite potentials upon the two control electrodes of? the repeaters 4-2 and 13. The auuilitied currents in the output circuit produced thereby, tlow in the same direction from the two halves oi the pri mary winding of transVernier -i--,i o that the amplified currents are lli'iPl'OSSPtl upon the outgoing line section to. incoming currents from line c t-ion 46, by transformer 47.. are impressed 1, non the (30111111011 portion l? the input circ. it of the two repeaters and censt-iqu-entr" produce adtliti e amplified currents in primary winding of transformer 4K8 so that these amplified currents n'iay he impressed upon the outgoing line section 49. i

Vacuum tuhe repeaters and 533 are as sociated in similar manner with line sections 5st, 56 and a for repeating currents from line section 36 to l e section 5? and irom line section 5:: to line tion as.

case a re'iezi'er desired tor phantom ciriuit operation oi the two 'l'our-wire rcpeater circuits shown in Q. vacuum tube leg/eaters (it) and (ii. may provided, hav ing an input trensfku'nier for line seetioni, h) and ll) connected to the mid points or traus'l'or:11ers i i and 4-8. {hug in tra:istornier (3 iler the two line sections ll) and l-li m y he connected to mid points oi' the windn of trimsiormers l and +7. a similar manner, an input tram Finer (A) may he provided for line sections :1) and 57 havin prinniry win din 59 connected to the m d po s of windings of transformers (l? and Outgoing transform-er for the derived phantom circuit oi line sections 3 lieen )(iltHS oil the three-electrode type, it is to )e understood that repeaters or other types may lie employed without departing, in any wise, from the spirit of this invention. it is also to he understood that this invention is not limiter to repeater circuits or tour-wire repeater circuits, but may be employed in any type of repeating system in which it is desired. to repeat more than one set of signals.

What is claimed is:

1. In an electric system. a plurality of re peaters, having input and. output circuits, saidinput circuits having portions in eomlit] mon and other portions individual to each repeater, means for impressing signals upon the common portion of said input circuits, means for impressing other signals upon the individual portions of said input circuits, and connections for selectively leadingpfi' in different electrical paths said first mentioned and said second mentioned signals from said output circuits.

2. In combination, two line sections, two vacuum tubes having input and output cir cuits, said input circuits having portions in common and other portions individual to each tube, means for impressing signals upon the common portion of said input circuits, means for impressing other signals upon the indi vidual portion of said input circuits, an impedance coupling between one of said line sections and said output circuits for impressing said first mentioned signals upon said one line section, and an impedance coupling between said output circuits and the other of said line sections for impressing thereon said second mentioned signals.

3. In combination, a plurality of vacuum tubes each having a control electrode and an output circuit, means for impressing signals upon said control electrode whereby the potential of one of said electrodes at one instant is changed difl'erently "from the potential of another of said electrodes, means for impressing upon said control electrodes other signals whereby the potentials of said electrodes are changed similarly, and connections from said output circuits for selectively leadingpli' said lirst mentioned and said second mentioned signals.

l. In combination, two vacuum tubes each having a control electrode, a cathode, an anode, and an output circuit, means for im pressing signaling currents upon said control electrodes whereby their potentials are changed oppositely, means for impressing other signaling currents upon said control electrodes whereby their potentials are changed similarly, and connections tov said output circuit individually leading-oil one set 01 said signals.

5. In combination, a line, a plurality of repeaters having input and output circuits, portions of said input and output circuits being individual to each repeater, portions of said input and output circuits being common to said repeaters, means for impressing signals fromjisaid line upon said common input circuit portions, and means for impressing on said line currents from said individual portions of said output circuit.

6. In combination, a line, a plurality of repeaters having input and output circuits, portions of said input and output circuits being individual to each repeater, portions of said input and output circuits being common to said repeaters, means for impressing signals from said line upon said individual portions of said input circuits, and means for impressing currents upon said line from the common portion of said output circuits.

7. In an electric system, two line sections, two vacuum tube repeaters located therebetween, and connections for utilizing said repeaters in opposition for repeating in one direction between said lines and for utilizing said repeaters in parallel for repeating in the opposite direction;

8. in an electric system, two line sections, and a two-way repeating system therebetween comprising two vacuum tube repeaters each having input and output circuits, said input circuits having portions in common and other portions individual to each repeater, said output circuits having portions in common and other portions individ ual to each repeater, means for impressing upon the individual portions 01' said input circuits currents from one of said line sections, means for impressing on the other line section currents from the individual portions of said output circuits while preventing the currents so impressed from being fed back upon the input circuits of said repeaters, means for impressing upon the common portion oi said input circuits currents from said other line section, and means for impressing on said one line section currents from the common portion of said output circuits while preventing currents so impressed from being fed back upon the input circuits of said repeaters.

In witness whereof I hereunto subscribe my name this 25th day of October, A. D. 1920. i 7

J ACOB S. J AMMER 

